He satisfied the impassioned demand of his nature for incessant activities of every kind by taking a personal as well as a pecuniary interest in the inventions of others. At one moment “the damned human race” was almost to be redeemed by a process of founding brass without air bubbles in it; if this could once be accomplished, as I understood, or misunderstood, brass could be used in art-printing to a degree hitherto impossible. I dare say I have got it wrong, but I am not mistaken as to Clemens’s enthusiasm for the process, and his heavy losses in paying its way to ultimate failure. He was simultaneously absorbed in the perfection of a type-setting machine, which he was paying the inventor a salary to bring to a perfection so expensive that it was practically impracticable. We were both printers by trade, and I could take the same interest in this wonderful piece of mechanism that he could; and it was so truly wonderful that it did everything but walk and talk. Its ingenious creator was so bent upon realizing the highest ideal in it that he produced a machine of quite unimpeachable efficiency. But it was so costly, when finished, that it could not be made for less than twenty thousand dollars, if the parts were made by hand. This sum was prohibitive of its introduction, unless the requisite capital could be found for making the parts by machinery, and Clemens spent many months in vainly trying to get this money together. In the mean time simpler machines had been invented and the market filled, and his investment of three hundred thousand dollars in the beautiful miracle remained permanent but not profitable. I once went with him to witness its performance, and it did seem to me the last word in its way, but it had been spoken too exquisitely, too fastidiously. I never heard him devote the inventor to the infernal gods, as he was apt to do with the geniuses he lost money by, and so I think he did not regard him as a traitor.